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    Effects of hybrid POSS nanoparticles on the properties of thermoplastic elastomer-toughened polyamide 6
    (Amer Chemical Soc, 2023) Yıldırım, Rümeysa; Ullah, Muhammad Saeed; Koçoğlu, Hürol; Un, Merve; Çakır, Nazlı Yazıcı; Demir, Gülşah; Çetin, Duygu
    In this study, polyamide 6 (PA6)/thermoplastic elastomer (TPE) blends were prepared to decrease the notch sensitivity of PA6 for automotive applications, and the morphological, rheological, mechanical, and thermal properties of PA6/TPE blends, which are partially miscible or immiscible depending on the TPE ratio, were significantly improved in the existence of polyhedral oligomeric silsesquioxane (POSS) nanoparticles with multiple reactive epoxy groups as compatibilizers. An unstable phase morphology was obtained with the addition of TPE into PA6 without POSS nanoparticles, whereas interfacial interactions between phases in the presence of POSS were enhanced as a result of a significant decrease in the average particle size from 1.39 to 0.41 mu m. The complex viscosity value of the 70PA6/30TPE blend, which was 20 kPa/s(-1) at 0.1 rad/s angular frequency, reached 380 kPa/s(-1) with the addition of POSS due to the formation of long chains by the generation of graft and/or block copolymers, which resulted in a 65% increase in Young's modulus value. Most notably, the Izod impact strength of pure PA6, which was 10 kJ/m(2), increased by 290% with the incorporation of POSS. It was confirmed by FTIR analysis that the reactive multiple epoxy groups of MultEpPOSS and EPPOSS nanoparticles react with the proper groups of PA6 and/or TPE, and also, a partial hydrogen bonding interaction occurs between PA6-TPE from the shifting of N-H and carbonyl peaks. In conclusion, it can be suggested that POSS nanoparticles can serve as highly effective compatibilizers for PA6/TPE blends and have potential commercial applications, especially in the automotive sector.
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    Investigation of effects of MoEpPOSS nanoparticle on the morphological and rheological properties of PA6/TPE blends
    (2024) Yıldırım, Rumeysa; Koçoğlu, Hürol; Ün, Merve; Ullah, Muhammad Saeed; Yakar, Ipek; Özkoç, Guralp; Mert, Olcay
    Polyamide 6 (PA6) is one of the used engineering thermoplastics with the advantages of high resistance to chemicals and abrasion, high fatigue resistance and toughness. However, it has some disadvantages such as low impact strength and notch sensitivity. The blend of PA6 with elastomers can mitigate these shortcomings. Lately, thermoplastic elastomers (TPE) have been frequently used to toughen notch-sensitive polymers such as PA6 due to their outstanding properties such as high elasticity, recyclability, and easy processing. As it is known, obtaining superior properties in polymer blends relies on the interfacial interaction between the components of the blend. Additionally, by using compatibilizers, blends with the required properties can be created by enhancing interaction between phases, or interfacial adhesion. Recently, polyhedral oligomeric silsesquioxane (POSS) nanoparticles, organic/inorganic hybrid nanoparticles, are preferred as an alternative compatibilizer to conventional types. In this study, PA6/TPE blends were compatibilized with POSS nanoparticle with single epoxy group (MoEpPOSS). The morphological and rheological properties of PA6/TPE blends compatibilized with MoEpPOSS nanoparticle were investigated. Also, possible chemical interactions between PA6 and/or TPE and MoEpPOSS nanoparticle were determined via Fourier transform infrared spectroscopy (FTIR) analyses.
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    POSS Reinforced PVC Nanocomposites
    (Springer Science and Business Media Deutschland GmbH, 2024) Ullah, Muhammad Saeed; Urtekin, Gizem; Koçoğlu, Hürol; Yıldırım, Rumeysa; Demir, Gülşah; Özkoç, Güralp; Kodal, Mehmet
    Over the past few years, research into polymers containing polyhedral oligomeric silsesquioxane (POSS) has grown, emphasizing new categories of polymer/polyhedral oligomeric silsesquioxane nanocomposite materials as well as previously unidentified uses. Due to the nano-scale size of polyhedral oligomeric silsesquioxane, these hybrids provide exceptional structural and functional qualities (strength, thermal stability, optical characteristics, low toxicity, and biocompatibility). This book chapter reviews the current development of polyhedral oligomeric silsesquioxane-reinforced poly(vinyl chloride) (PVC) systems. Chlorine atoms in PVC make it a more rigid and stiffer material by increasing the intermolecular attraction between polymer chains. These hybrid POSS nanofillers were found to be simple to incorporate into PVC and may be able to construct, reinforce, and stabilize materials more effectively than conventional ones. The key focus of this chapter was the morphological, thermal, mechanical, and rheological properties of the POSS reinforced PVC nanocomposites. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.